a-lunev edited a comment on issue #3737:
URL:
https://github.com/apache/incubator-nuttx/issues/3737#issuecomment-844337725
Hi @patacongo,
The file system (romfs) and file search PATH are good indeed.
The error code ("ERROR: exec(errno) failed: 2") is confusing and does not
expose the real cause. This is not "No such file or directory" cause.
I've enabled debug logs and the real cause has been exposed:
```
testheader:
****************************************************************************
* Executing errno
****************************************************************************
errno
load_absmodule: Loading /mnt/romfs/errno
nxflat_loadbinary: Loading file: /mnt/romfs/errno
nxflat_init: filename: /mnt/romfs/errno loadinfo: 0x20003d50
nxflat_read: Read 36 bytes from offset 0
nxflat_dumploadinfo: LOAD_INFO:
nxflat_dumploadinfo: ISPACE:
nxflat_dumploadinfo: ispace: 00000000
nxflat_dumploadinfo: entryoffs: 000000a4
nxflat_dumploadinfo: isize: 000001ba
nxflat_dumploadinfo: DSPACE:
nxflat_dumploadinfo: dspace: 00000000
nxflat_dumploadinfo: datasize: 00000040
nxflat_dumploadinfo: bsssize: 00000000
nxflat_dumploadinfo: (pad): 00000000
nxflat_dumploadinfo: stacksize: 00000800
nxflat_dumploadinfo: dsize: 00000040
nxflat_dumploadinfo: RELOCS:
nxflat_dumploadinfo: relocstart: 000001fa
nxflat_dumploadinfo: reloccount: 11
nxflat_dumploadinfo: HANDLES:
nxflat_dumploadinfo: filfd: 3
nxflat_load: Mapped ISpace (442 bytes) at 00019d54
nxflat_load: Allocated DSpace (108 bytes) at 0x200040c0
nxflat_read: Read 108 bytes from offset 442
nxflat_load: TEXT: 00019d54 Entry point offset: 000000a4 Data offset:
000001ba
nxflat_dumploadinfo: LOAD_INFO:
nxflat_dumploadinfo: ISPACE:
nxflat_dumploadinfo: ispace: 00019d54
nxflat_dumploadinfo: entryoffs: 000000a4
nxflat_dumploadinfo: isize: 000001ba
nxflat_dumploadinfo: DSPACE:
nxflat_dumploadinfo: dspace: 200040b0
nxflat_dumploadinfo: crefs: 1
nxflat_dumploadinfo: region: 200040c0
nxflat_dumploadinfo: datasize: 00000040
nxflat_dumploadinfo: bsssize: 00000000
nxflat_dumploadinfo: (pad): 0000002c
nxflat_dumploadinfo: stacksize: 00000800
nxflat_dumploadinfo: dsize: 0000006c
nxflat_dumploadinfo: RELOCS:
nxflat_dumploadinfo: relocstart: 000001fa
nxflat_dumploadinfo: reloccount: 11
nxflat_dumploadinfo: HANDLES:
nxflat_dumploadinfo: filfd: 3
nxflat_bindimports: Imports offset: 000001d2 nimports: 5
nxflat_bindimports: Import[0] (0x200040d8) offset: 00000000 func: 00000000
nxflat_bindimports: Exported symbol "__errno" not found
nxflat_loadbinary: Failed to bind symbols program binary: -2
exec_spawn: ERROR: Failed to load program 'errno': -2
nxflat_main: ERROR: exec(errno) failed: 2
```
As it turned out, symtab.c is generated with an empty g_nxflat_exports array.
Makefile invokes $(APPDIR)/tools/mksymtab.sh script, that in turn invokes
the host level "nm":
`nm: errno: file format not recognized`
As I understand, nxflat example was broken somewhere in 2020.
I was able to find that nuttx-8.2 still worked correctly concerning this
particular issue (the symbol table is generated successfully, and nxflat
example normally works in nuttx-8.2).
However, nuttx-9.1.0 and any newer state in nuttx repo are already broken.
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